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require File.dirname(__FILE__) + '/base'
# Experimental!!! See also the Spider graph.
class Gruff::Net < Gruff::Base
# Hide parts of the graph to fit more datapoints, or for a different appearance.
attr_accessor :hide_dots
# Dimensions of lines and dots; calculated based on dataset size if left unspecified
attr_accessor :line_width
attr_accessor :dot_radius
def initialize(*args)
super
@hide_dots = false
@hide_line_numbers = true
end
def draw
super
return unless @has_data
@radius = @graph_height / 2.0
@center_x = @graph_left + (@graph_width / 2.0)
@center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit
@x_increment = @graph_width / (@column_count - 1).to_f
circle_radius = dot_radius ||
clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 2.5), 5.0)
@d = @d.stroke_opacity 1.0
@d = @d.stroke_width line_width ||
clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 4), 5.0)
if (defined?(@norm_baseline)) then
level = @graph_top + (@graph_height - @norm_baseline * @graph_height)
@d = @d.push
@d.stroke_color @baseline_color
@d.fill_opacity 0.0
@d.stroke_dasharray(10, 20)
@d.stroke_width 5
@d.line(@graph_left, level, @graph_left + @graph_width, level)
@d = @d.pop
end
@norm_data.each do |data_row|
prev_x = prev_y = nil
@d = @d.stroke data_row[DATA_COLOR_INDEX]
@d = @d.fill data_row[DATA_COLOR_INDEX]
data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index|
next if data_point.nil?
rad_pos = index * Math::PI * 2 / @column_count
point_distance = data_point * @radius
start_x = @center_x + Math::sin(rad_pos) * point_distance
start_y = @center_y - Math::cos(rad_pos) * point_distance
next_index = index + 1 < data_row[DATA_VALUES_INDEX].length ? index + 1 : 0
next_rad_pos = next_index * Math::PI * 2 / @column_count
next_point_distance = data_row[DATA_VALUES_INDEX][next_index] * @radius
end_x = @center_x + Math::sin(next_rad_pos) * next_point_distance
end_y = @center_y - Math::cos(next_rad_pos) * next_point_distance
@d = @d.line(start_x, start_y, end_x, end_y)
@d = @d.circle(start_x, start_y, start_x - circle_radius, start_y) unless @hide_dots
end
end
@d.draw(@base_image)
end
# the lines connecting in the center, with the first line vertical
def draw_line_markers
return if @hide_line_markers
# have to do this here (AGAIN)... see draw() in this class
# because this funtion is called before the @radius, @center_x and @center_y are set
@radius = @graph_height / 2.0
@center_x = @graph_left + (@graph_width / 2.0)
@center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit
# Draw horizontal line markers and annotate with numbers
@d = @d.stroke(@marker_color)
@d = @d.stroke_width 1
(0..@column_count-1).each do |index|
rad_pos = index * Math::PI * 2 / @column_count
@d = @d.line(@center_x, @center_y, @center_x + Math::sin(rad_pos) * @radius, @center_y - Math::cos(rad_pos) * @radius)
marker_label = labels[index] ? labels[index].to_s : '000'
draw_label(@center_x, @center_y, rad_pos * 360 / (2 * Math::PI), @radius, marker_label)
end
end
private
def draw_label(center_x, center_y, angle, radius, amount)
r_offset = 1.1
x_offset = center_x # + 15 # The label points need to be tweaked slightly
y_offset = center_y # + 0 # This one doesn't though
x = x_offset + (radius * r_offset * Math.sin(angle.deg2rad))
y = y_offset - (radius * r_offset * Math.cos(angle.deg2rad))
# Draw label
@d.fill = @marker_color
@d.font = @font if @font
@d.pointsize = scale_fontsize(20)
@d.stroke = 'transparent'
@d.font_weight = BoldWeight
@d.gravity = CenterGravity
@d.annotate_scaled(@base_image, 0, 0, x, y, amount, @scale)
end
end
# # This method is already in Float
# class Float
# # Used for degree => radian conversions
# def deg2rad
# self * (Math::PI/180.0)
# end
# end
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